四分律行事鈔資持記 1.1294

1.1294

次受衣中，次科。上座跪者，準下三座皆然。却行，即退身也。所以自恣對二三人，今對四人者，思之可解。

In the subsequent reception of the robe, in the next sub-heading: 'The sthavira kneels' is, according to below, the same for all three elders. 'Walking backward' means retreating one's body. As for why pravāraṇā is done facing two or three persons, whereas now it is done facing four persons, by contemplating this, it can be understood.